package com.yuuzy.aspect;

import com.yuuzy.annotation.AutoFill;
import com.yuuzy.constant.AutoFillConstant;
import com.yuuzy.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.annotation.Pointcut;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.time.LocalDateTime;

/**
 * 自定义切面类，实现公共字段自动填充处理逻辑
 */
@Aspect
@Component
@Slf4j
public class AutoFillAspect {

	/**
	 * 切入点
	 */
	@Pointcut("execution(* com.yuuzy.mapper.*.*(..)) && @annotation(com.yuuzy.annotation.AutoFill)")
	public void autoFillPointCut() {
	}

	/**
	 * 前置通知，在通知中进行公共字段的赋值
	 */
	@Before("autoFillPointCut()")
	public void autoFill(JoinPoint joinPoint) throws NoSuchMethodException, InvocationTargetException, IllegalAccessException {
		log.info("开始进行公共字段的自动填充...");

		//获取到当前被拦截的方法上的数据库操作类型
		MethodSignature signature = (MethodSignature) joinPoint.getSignature();//方法签名对象
		AutoFill autoFill = signature.getMethod().getAnnotation(AutoFill.class);//获得注解对象
		OperationType operationType = autoFill.value();//获得数据库操作类型

		//获取到当前被拦截的方法的参数--实体对象
		Object[] args = joinPoint.getArgs();
		if (args == null || args.length == 0) {
			return;
		}

		Object entity = args[0];

		//准备赋值的数据
		LocalDateTime now = LocalDateTime.now();

		//根据当前不同的操作类型，为对应的属性通过反射来赋值
		if (operationType == OperationType.INSERT) {
			Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
			Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
			//赋值
			setCreateTime.invoke(entity, now);
			setUpdateTime.invoke(entity, now);

		} else if (operationType == OperationType.UPDATE) {

			Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
			setUpdateTime.invoke(entity, now);
		}

	}
}
